Currently, I am working for a digital advertising firm, where we used to take part in real-time advertising auctions, handles around 400k-500k bid-requests per second, our cloud servers (we call them bidder-servers) are constantly bidding & serving a large number of ads globally. We are using REDIS as well for realtime data retrieval. It's really important for bidder-servers to read the very latest key information regarding each campaign in a fastest manner.